log handling not idempotent across tests

[thclark]

Bug report

What is the current behavior?

We are leaking global logger state across tests, and as a result get a pytest error:

/usr/local/bin/python ~/.vscode-server/extensions/ms-python.python-2022.8.1/pythonFiles/testing_tools/run_adapter.py discover pytest -- --rootdir . -s --cache-clear
cwd: .
[ERROR 2022-6-6 9:43:24.553]: Error discovering pytest tests:
 [n [Error]: --- Logging error ---
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/logging/__init__.py", line 1086, in emit
    stream.write(msg + self.terminator)
ValueError: I/O operation on closed file.
Call stack:
  File "/usr/local/lib/python3.9/multiprocessing/util.py", line 332, in _exit_function
    info('process shutting down')
  File "/usr/local/lib/python3.9/multiprocessing/util.py", line 54, in info
    _logger.log(INFO, msg, *args)
Message: 'process shutting down'
Arguments: ()

The issue is as described here: pytest-dev/pytest#5743

What is the expected behavior?

The log handlers need to be cleaned up on a per-test basis in order to allow the tests to run in an idempotent way.